Last-lathe.



M. H. LYONS.

LAST LATHE.

APPLIOATION FILED APR. 28, 1909.

Patented Apr. 12, 1910 2 SHBETB-BHEET 1.

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M. H. LYON S. LASTLATHE.

APPLICATION FILED APR. 28, 1909. 954,447.

2 8HEETS-SHBET 2.

Patented Apr. 12, 1910.

' To all whom it may concern:

UNITED STATES PATENT OFFICE.

MICHAEL H. LYONS, OF BROCKTON, MASSACHUSETTS.

LAST-LATHE.

Specification of Letters Patent.

Patented Apr. 12, 1910.

Application filed April 28, 19,09. Serial No, 492,646,.

Be it known that I, MICHAEL H. LYONS,

' a citizen of the United States, residing at In turning certainirregular shapes such as modern shoe-lasts, special curves are met withwhich it is practically impossible to 7 turn properly with the presentturning lathe. For instance, the modern tendency in last manufacture isto have a very narrow cone, and in some styles of lasts there arevarious sharp bends,- and it has been found necessary to do considerablyhand shaving on lasts at those points because the pattern wheel and therotary cutter of the ordinar lathe has been unable to follow into anreproduce these sharp curves. "Accordingly my invention aims to providemeans for overcoming these defects. To this end I use a small patternwheel and small cutterhead, which are set obliquely to the work, all aswill be more a parent from the following description, re erenco beinghad to the accompanyin drawings, in which I have shown a preferreembodiment of the invention. e I

In the drawings, Figure 1 shows in front elevation a regular Kimball &Sprague lathe, having my invention applied thereto;

Figs. 2 and 3 are views in side elevation and cross-section respectivelyof a last, showmg the special work which it is the object ofmy'invention to accomplish; Fi' 41s a cross-sectional detail showing insi e elevation the arrangement of the pattern wheel supportingmechanism; Fig. 5 is a fragmentary top plan view of sufficient parts ofthe machine to make my invention readily understood; Fig, 6 is anenlarged cross-sectional detail similarto Fig. 4, showing the relativeposition of the cutterhead and its my invention is applicable to any ofthe operating mechanism; and Fig. 7 is a fragmentary View in sideelevation of said out well-known lathes. As herein shown, a.

model 1 is held in place in usual manner inthe swing frame 2 of themachine, said swing frame being ivoted at 3. to the main frame 4 of themac inc and driven b belts 5, 6, 7, and the work or last bl 8 is mountdin usual manner at the opposite end.

of said swing frame. I deem it unnecessary to go into a detailedexplanation of the last lathe itself as. all the arts, and operationthereofare old and wel -known. v

Cooperatin with the model is a pattern wheel 9 whic is substantially thesame as axis is oblique to or out of parallelism with the axis ofrotation of the model or pattern 1.. This small pattern wheel 9 isjournaled at 10 in the angular-1y bent or oblique 'end 11 of a slidesupport 12 held adjustably bya heretofore excepting that it is small andits hand screw 13 in dove-tailed ways 14 of an upright frame 15 mountedto reciprocatev longitudinally of the machine in usual manner on ways16.

Cooperating with the last block 8 is a I small cutterhead 17 of the samediameter and peripheral shape and size as the pattern wheel 9 andset torotate at the same oblique angle as the pattern wheel, being hereinshown as mounted at the end of the axis 18 journaled at 19 in standards20 extending u wardly from a carriage 21 mounted to slide longitudinallyof the lathe on ways 22 the same as the pattern carriage 15. Thecutter-head may be driven by any suitable means, but to adapt it to thetype of lathe herein shown I have provided a pulley 23 on the shaft 18.connected by a belt 24 to a pulley 25 on a shaft 26 set obliquely on astand ard 27 and carrying a small pulley 28 from which abelt 29 extendsover an idler or direction pulley 30 to the usual driving drum 31. Thecutter carriage is provided with a usual rack 32 driven by a toothedpinion 33 and a train of gears 34, 35, 33, from a belt pulley 37, andthe cutter carriage and pat-.

tern wheel carriage are connected in usual manner by bars 38, 39,.adjustably secured by a hand screw 40, andby grading-meow anism 41, allof which being the same as heretofore it is unnecessary to explain. 3

The cutterhead has at its front side a noselike portion 42 heldadjustably in the rest of the. outterhead h a'set screw 43 which pre- 1plicable to the various last-turning lathes,

- same as heretofore, but, because of the spe- 47, 48, 49, Figs. 2 and3. If the axes o ahead of the finishing 'cial features which constitutemy invention, it becomes possible to turn a last even of the extremeshapeshown in Figs. Qand 3. v The projecting portion 50 of the workWOIIldf bG liable to hit the shaft or journal or adjacent portion of thecutter when the latter was cutting at 47 It has heretofore beenconsidered necessary to emplpy a large cutter because certain of thecutter blades have been gou 'ng cutters, and intermediate blades .haveeen finishing cutters, but by having the gouging or ,ation of thecutter.

routing cutters at the front as at 42in my cutter, I am enabled tosecure all the requisites of properand ra id removal of the wood, andleave all the ishin cutters together to constitute simply the erationseparate from the rough-work oper- Furthermore, by thus reducing thesize and setting the axis obliquely as shown and explained, the cutter(and also the pattern wheel) is enabled to enter considerably within theextreme outer circle of rotation of the work (and pattern or model) forforming any desired rentrant curvatures such as shown at 45-49, withoutinterfering in anyway with the work. As the angle of the supportinspindle 18 is ob-j lique, 1t is carried away rom the projectmg portionsof the work so that the latter the internal curves 45-49. mentioned.

claim as new,

cannot hit it or any of the adjacent parts as the work rotates while thecutter is cuttin As already intimated, my invention is apand also is notconfined to the precise constructional details herein shown, as manyvariations in shape and arrangement may be resorted to" withoutdeparting from the spirit and scope of the invention as defined 1n theappended claims.

Having described my invention, what I and desire to secure by LettersPatent is:

the work but materially increasing,

ishing op- 1. .In a last-turning lathe, the combina tion withwork-holding meansand model:

holding means, of a cutter spindle set; ob-

liquely to the longitudinal axls of the work at an angle away from thework in a direction away from that of the feed when cutting; having itsend which is nearer and whic points toward the work and which extends 7,

toward the workin the direction of the rela tive cutting movement freelyPI'OJEOtlIlg be-' yond its bearings, a cutter on said free end. of saidspindle having a finishing portion of relatively large diameterprojecting-radially;

beyond said bearings, and a patternwheel' for engaging the model set inthe same relation to the model that said cutter is set with relation' tothe, work and ad ustable relatively to said cutter toward and from thework. v p

2.. In a last-turning lathe, the-combination with work-holding'means andmodel-holding means, of a cutter spindle set obliquely to thelongitudinal axis of the work, having its end which is nearer the workand which extends in the directibn of the relative cutting movement.freely proj eating beyond ts bearings, a cutter on said free end of saidspindle, said cutter having atits forward end a rough-work turningportion of rela tively small diameter, and between said front end andits bearings a finishing por- 1 tion' of relatively large diameter.

3. In a last-turning lathe, thecombina- 'tion with work-holding meansand modelholding means, of a small cutter capable of cutting inaccordance with the sharp curves and reentrant angles of an extreme lastmodel, "said small cutter having ts axial support set with'relation tothe work at such an oblique angle extending awayfrom the work as to beentirely outside of the range of movement of the projecting finishedortions of the work, and having a. finls mg portion of relatively largediameter extendmgfre'ely' beyond said bearings anda cen tral forwardlypiojectmg-rough-work turning portion of relatively small diameter, and

' a small pattern member for following .the

model adjustable toward and from the work,

having the same engaging size and shape as the cutter and set at thesame angle with relation to. the model as said cutter is, set

with relation to the work. a

In testimony'whereof, I have signed my name to this specification, inthe presence of MICHAEL H. LYONS. f Witnesses:

. FRED L. SPRAGUE,

\ FRED BRmowoon.

two subscribing witnesses.-

